Using water as a quenchant | Thermal Processing Magazine
Water is used whenever the drastic quench will not cause cracking or excessive distortion. It is widely used for quenching non-ferrous alloys, austenitic stainless steels, and …
Stabilized slag after (a) granulation, (b) water quenching, …
Rapid cooling could reduce the content of RO phase in steel slag, and the content of RO phase for the furnace cooling, air cooling, mist cooling, and water quenching samples were 28.03%, 22.53% ...
Energy and exergy analysis of waste heat recovery from
In the converter steelmaking process, an average of 0.12–0.14 tons of steel slag is produced per ton of steel . Water quenching, drumming, hot splashing, and hot stewing are primary treatments steel slag methods [3,4,5]. However, these methods exhibit low efficiency and poor environmental benefits, resulting in resource wastage.
Water quenching might sound like a straight-forward …
Water quenching might sound like a straight-forward process, but there are plenty of guidelines and rules for using it. Heat treatment of aluminum, part II: Water quenching I Water Maximum Maximum Cooling Rate (°C/s) at T Temperature (°C) Cooling Rate (°C/s) Cooling Rate 704°C 343°C 232°C Temperature (°C) 40153 53560 97 51
A review of waste heat recovery technologies towards molten slag …
Water quenching is a traditional heat recovery technology, which uses cold water to cool down slag so as to achieve the desired glassy by-products. ... Science and Technology Support Project called "Electricity generation using low pressure waste heat steam and air quenching technology for modified steel slag" since 2008 and a semi ...
Utilisation perspective on water quenched and air-cooled …
The process of granulation is a controlled rapid quenching of the BF slag in cold water with minimum scope for crystal growth. A large volume of water is used (at a ratio of 10:1 of water and molten slag) on to the molten slag to facilitate accelerated cooling under this environment and gets converted into the amorphous particles of sand size ...
Treatment procedure of water quenching blast …
Water quenching blast furnace slag (WQBFS) is widely produced in the blast furnace iron making process. It is mainly composed of CaO, MgO, Al2O3, and SiO2 with low contents of other metal elements ...
Comprehensive utilisation of blast furnace slag
The water quenching granulation process, also known as the wet treatment process, is a process that uses a high-pressure water stream to quickly cool the blast fur-
Numerical investigation of breakup process of molten blast furnace slag
Molten slag is broken up by supersonic air into droplets through the air quenching dry slag granulation technique. The breakup process of blast furnace slag directly determines the droplet diameter and the waste heat recovery. In order to gain deep insight into the granulation mechanism and visualize the breakup process, three-dimensional unsteady numerical …
A Review of Granulation Process for Blast Furnace Slag
The steel industry is one of the most energy-intensive industries in China. Based on statistics of World Steel Association, China's crude steel output reaches 823 ... However, there are many defects of water-quenching slag method, which can be roughly concluded as follow: a mass of sensible heat unrecovered, high water consumption, air ...
Iron recovery from lead smelting water-quenching slag by …
The iron in the water-quenching slag before roasting exists in the form of magnetite, but it is difficult to dissociate due to the fine particles. Conversely, the iron in the burned slag after roasting exists in the form of dissociated metallic iron, and it can be recovered better via grinding and magnetic separation. This study provides new ...
Current Development of Slag Valorisation in China
The hot stage steel slag (BOF) pyrolytic self-slaking process has made progress and are applied in a number of large steel companies in China. The slag valorisation in China improved gradually not only in quantity but also in quality, thereby increasing the economical and environmental benefits. ... Water for quenching is in circulation.
Comprehensive utilization of steel slag: A review
Steel slag, the main solid waste in the steel-making process, is produced more than 120 million tons annually in China.Most of the steel slag was stored in the open air, which brought potential safety and environmental protection risks such as land occupation and infiltration of heavy metal components into the soil. In recent years, the utilization and application of steel …
Stabilization of Stainless Steel Slag via Air Granulation
In stainless steel production, slag from argon oxygen decarburization (AOD) converters is dumped on to the ground and then slowly cooled. ... (reference sample obtained from water quenching of slag from the ladle). For several tests, Sample A (granulated slag) was collected as three fractions based on its locational distance from the ...
Investigation of Properties of Air-Quenched Steel Slag as …
In order to effectively improve the environmental problems caused by steel slag stacking, the air-quenching process of molten steel slag was carried out, and the properties of the air-quenched steel slag (AQSS) has been investigated by various characterization methods. The results show that the main phases of AQSS were Ca2SiO4, RO phase (solid solution formed …
Quenching Explained – Definition, Process, Benefits and More
Water is non-flammable which gives it an advantage over oil. It is also a cheap and pollution-free alternative. However, water will distort or crack the metal if the process is not controlled well. Brine (Salt Water) Brine or salt water is one of the most effective quenching media. It gives a higher quenching rate than oil, water and air.
High-temperature modification and air-quenching …
quenching and water-cooling to deal with steel slag and realized industrial production [13], through which the uti-lization rate of steel slag has been improved significantly. In addition, due to the advantages of high sphericity and good stability, air-quenched steel slag has been applied to abrasive [14] and concrete fine aggregate [15 ...
A study on water-quenching waste heat recovery from molten slag of slag
To solve high sensible heat loss problem of molten slag, three water-quenching waste heat recovery systems are proposed. For subcooled- and boiling-water-quenching systems, the condensate water can be heated. ... (SM-8)–(SM-12) (Supplementary Material). After evaluating the steel consumption of the heat exchanger, it can be found that their ...
Effect of Quenching Method on the Structure of Glass Slag
The fitting results of Raman spectra for glass slags obtained by quenching in water and on stainless steel plate are displayed in Fig. 2b and c, respectively. It can be seen from Fig. 2b and c that there were five symmetric bands for the two glasses, ~ 745, ~ 795, ~ 855, ~ 910, and ~ 1035 cm −1.Among them, the band at ~ 745 cm −1 and at ~ 795 cm −1 …
What Types of Steel Can You Water Quench?
Water quenching is an umbrella term used to describe a heat treatment process in which a heated metal component is rapidly cooled by immersing it in a water-based quenchant. There are four different types of water-based …
An Overview of Utilization of Blast Furnace and Steelmaking Slag …
After being rapidly cooled down by water quenching, the resulting glassy and granular form of blast furnace slag (BFS) renders this byproduct of iron and steel production an excellent substitute material for the production of Portland …
Effect of Cr-solidified/stabilized Water-quenched Slag on …
Both laboratory and industrial tests used water-quenched blast furnace slag from steel plants ... The microstructure of water-quenching slag and composite slag cement shows that the Cr element in the system has gone through two ways: chemical reaction and physical wrapping, achieving the triple solidification of spinel-glass structure-cement ...
A study on water-quenching waste heat recovery from …
In this study, three water-quenching waste heat recovery systems are proposed to solve high slag sensible heat loss problem of the slag-tap boiler. Thermal-economic analyses …
Granulation and Heat Recovery from Metallurgical Slags
In water granulation, the liquid slag is quenched as quickly as possible with a large quantity of water. This fast quenching ensures the highest glass content in the solidified product. For fast heat transfer and quenching, it is important to disperse the molten slag into small droplets very quickly. ... Characteristics of steel slag under ...
Integrated treatment of GCP and slag quenching water of LD steel …
Continuous plant trial for combined treatment Integrated treatment of GCP and slag quenching water of LD steel making unit of GCP and SQ wastewater with CO2 sparging was carried out for 180 days in a full scale clarifier based on the optimum condition obtained from the bench scale study. Results and discussion Treatment of GCP and SQ ...
SLAG
molten slag by means of high-pressure water jets. Quenching prevents crystallisation, thus resulting in granular, glassy aggregates. This slag is crushed, ... Steel slag can also replace granulated blast furnace slag up to 10% in the manufacture of Portland Slag Cement. Steel slags are produced at steel melting
Characteristics of steel slag under different cooling conditions
how water quenching of steel slag results in products with. a high content of glassy material. Silicate melts have high. viscosity due to long molecule chains, and rearrangement.
Structure characterization and grinding performance of …
Gas-quenched steel slag abrasive was obtained by gas quenching with high-temperature liquid steel slag as raw material. The phase composition, thermal properties, micromorphology, magnetic properties, and mechanical properties of the particles were characterized by using an X-ray diffractometer, a differential thermal analyzer, a scanning …
Quenched Slag
The water-quenching process generated a mass of activated compositions and enhanced the stiffness of the slag. In particular, some vitreous grains were formed in this process. The chemical compositions and density of the WQS are given in Table 4.27. ... Steel slag aggregates can be acidic or basic and can leach hazardous elements ...
Structure characterization and grinding performance of …
Steel slag is the main solid waste during steel production [1 ]. This slag is formed by the oxidation of impurities, such as ... air quenching, roller, water quenching, and heat sealing [, 56]. Studies have found that steel slag can be used as a sintering material [7 ], raw mate-rial for potassium silicate fertilizer [], and material for 8